Блог пользователя matrix191943

Автор matrix191943, история, 3 месяца назад, По-английски

You can watch the questions here.It was one of the questions in our school question bank and I tried to solve it, but unluckily that I didn't know how. Can you help me find the official solution to this problem (or this contest)? Thank you!

Sorry, my English isn't very good.:<

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